CS ACNS.D.AC.015 Data transmission
ED Decision 2013/031/R
(See AMC1 ACNS.D.AC.015)
The surveillance system provides the following data in the replies:
(a) The Mode A identity code in the range 0000 to 7777 (Octal).
(b) The pressure altitude corresponding to within plus or minus 38.1 m (125 ft), on a 95 % probability basis, with the pressure-altitude information (referenced to the standard pressure setting of 1.01325 105 Pa),used on board the aircraft to adhere to the assigned flight profile. The pressure altitude ranges from minus 304 m (1 000 ft) to the maximum certificated altitude of aircraft plus 1520 m (5 000 ft).
(c) Special Position Indication (SPI) for 15 to 30 seconds after an IDENT (SPI) command has been initiated by the pilot.
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